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// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Management Interface (SCMI) System Power Protocol
*
* Copyright (C) 2020-2022 ARM Ltd.
*/
#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
#include <linux/module.h>
#include <linux/scmi_protocol.h>
#include "protocols.h"
#include "notify.h"
/* Updated only after ALL the mandatory features for that version are merged */
#define SCMI_PROTOCOL_SUPPORTED_VERSION 0x20001
#define SCMI_SYSTEM_NUM_SOURCES 1
enum scmi_system_protocol_cmd {
SYSTEM_POWER_STATE_NOTIFY = 0x5,
};
struct scmi_system_power_state_notify {
__le32 notify_enable;
};
struct scmi_system_power_state_notifier_payld {
__le32 agent_id;
__le32 flags;
__le32 system_state;
__le32 timeout;
};
struct scmi_system_info {
u32 version;
bool graceful_timeout_supported;
bool power_state_notify_cmd;
};
static bool scmi_system_notify_supported(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id)
{
struct scmi_system_info *pinfo = ph->get_priv(ph);
if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER)
return false;
return pinfo->power_state_notify_cmd;
}
static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
bool enable)
{
int ret;
struct scmi_xfer *t;
struct scmi_system_power_state_notify *notify;
ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY,
sizeof(*notify), 0, &t);
if (ret)
return ret;
notify = t->tx.buf;
notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id, bool enable)
{
int ret;
ret = scmi_system_request_notify(ph, enable);
if (ret)
pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
return ret;
}
static void *
scmi_system_fill_custom_report(const struct scmi_protocol_handle *ph,
u8 evt_id, ktime_t timestamp,
const void *payld, size_t payld_sz,
void *report, u32 *src_id)
{
size_t expected_sz;
const struct scmi_system_power_state_notifier_payld *p = payld;
struct scmi_system_power_state_notifier_report *r = report;
struct scmi_system_info *pinfo = ph->get_priv(ph);
expected_sz = pinfo->graceful_timeout_supported ?
sizeof(*p) : sizeof(*p) - sizeof(__le32);
if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
payld_sz != expected_sz)
return NULL;
r->timestamp = timestamp;
r->agent_id = le32_to_cpu(p->agent_id);
r->flags = le32_to_cpu(p->flags);
r->system_state = le32_to_cpu(p->system_state);
if (pinfo->graceful_timeout_supported &&
r->system_state == SCMI_SYSTEM_SHUTDOWN &&
SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(r->flags))
r->timeout = le32_to_cpu(p->timeout);
else
r->timeout = 0x00;
*src_id = 0;
return r;
}
static const struct scmi_event system_events[] = {
{
.id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
.max_payld_sz =
sizeof(struct scmi_system_power_state_notifier_payld),
.max_report_sz =
sizeof(struct scmi_system_power_state_notifier_report),
},
};
static const struct scmi_event_ops system_event_ops = {
.is_notify_supported = scmi_system_notify_supported,
.set_notify_enabled = scmi_system_set_notify_enabled,
.fill_custom_report = scmi_system_fill_custom_report,
};
static const struct scmi_protocol_events system_protocol_events = {
.queue_sz = SCMI_PROTO_QUEUE_SZ,
.ops = &system_event_ops,
.evts = system_events,
.num_events = ARRAY_SIZE(system_events),
.num_sources = SCMI_SYSTEM_NUM_SOURCES,
};
static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
{
int ret;
u32 version;
struct scmi_system_info *pinfo;
ret = ph->xops->version_get(ph, &version);
if (ret)
return ret;
dev_dbg(ph->dev, "System Power Version %d.%d\n",
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
if (!pinfo)
return -ENOMEM;
pinfo->version = version;
if (PROTOCOL_REV_MAJOR(pinfo->version) >= 0x2)
pinfo->graceful_timeout_supported = true;
if (!ph->hops->protocol_msg_check(ph, SYSTEM_POWER_STATE_NOTIFY, NULL))
pinfo->power_state_notify_cmd = true;
return ph->set_priv(ph, pinfo, version);
}
static const struct scmi_protocol scmi_system = {
.id = SCMI_PROTOCOL_SYSTEM,
.owner = THIS_MODULE,
.instance_init = &scmi_system_protocol_init,
.ops = NULL,
.events = &system_protocol_events,
.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
};
DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system)
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